| ACV Drylining Ltd | Construction | 2020 |
| Acxesa S DE RL DE CV Ltd | Transport & logistics | 2025 |
| AD & JD Ltd | Wholesale & retail | 2021 |
| AD Carpenters Ltd | Construction | 2025 |
| AD Express Limited | Transport & logistics | 2024 |
| AD Grocers Ltd | Wholesale & retail | 2025 |
| AD Photo LAB Ltd | Professional & scientific | 2016 |
| AD Traders Ltd | Professional & scientific | 2019 |
| AD Xray Ltd | Financial services | 2023 |
| Ad-Deen Al-Khalis Community Interest Company | Health & social care | 2025 |
| AD14 Tech Solutions Limited | Information & communication | 2021 |
| ADA Medical Ltd | Health & social care | 2014 |
| ADA Turkish Restaurant Limited | Hospitality | 2016 |
| Adail Khan Fruit & VEG Limited | Wholesale & retail | 2018 |
| Adalat Traders Limited | Hospitality | 2013 |
| Adalink Medical Services Ltd. | Health & social care | 2014 |
| Adallen Pharma Limited | Wholesale & retail | 2001 |
| Adam AA Ltd | Construction | 2024 |
| Adam Accountancy Services Ltd | Professional & scientific | 2010 |
| Adam Alexander Spencer Ltd | Extraterritorial | 2024 |
| Adam and EVE Ltd | Wholesale & retail | 2023 |
| Adam Ashar Limited | Transport & logistics | 2018 |
| Adam Berkeley Ltd | Real estate | 2021 |
| Adam Building & Civil Engineering Limited | Construction | 2016 |
| Adam Design Work Ltd | Professional & scientific | 2024 |
| Adam Inc Limited | Real estate | 2018 |
| Adam Removal and Logistics Ltd | Transport & logistics | 2025 |
| Adam Residential Properties Limited | Real estate | 2018 |
| Adam Security UK Limited | Financial services | 2023 |
| Adam Software Services Ltd | Information & communication | 2020 |
| Adamford Limited | Professional & scientific | 1983 |
| Adams Consultancy Ltd | Professional & scientific | 2022 |
| Adams Line Ltd | Wholesale & retail | 2025 |
| Adamsmart Ltd | Wholesale & retail | 2020 |
| Adamz Chicken Ltd | Hospitality | 2021 |
| Adamz Investments Ltd | Real estate | 2025 |
| Adan Trades Ltd | Wholesale & retail | 2024 |
| Adana Resturant Ilford Ltd | Hospitality | 2025 |
| Adanacuisine Ltd | Hospitality | 2023 |
| Adani Power Limited | Extraterritorial | 2015 |
| Adanna Women's Support Group Ltd | Information & communication | 2006 |
| Adantay Ltd | Real estate | 2026 |
| Adaptive Comfort Living Ltd | Manufacturing | 2025 |
| Adbunik Limited | Construction | 2025 |
| Adcentra Limited | Professional & scientific | 2025 |
| Adda Cafe Plus Limited | Hospitality | 2019 |
| Addison Autos Limited | Wholesale & retail | 2013 |
| Additional Care Ltd | Administrative & support | 2019 |
| Addo Finance Limited | Professional & scientific | 2019 |
| Addshiyas Ltd | Other services | 2013 |
| Addy Builder & Construction Ltd | Construction | 2019 |
| ADE Elevate Limited | Real estate | 2025 |
| Adeasy Property Solutions Ltd | Households | 2021 |
| Adebfola Limited | Wholesale & retail | 2015 |
| Adel Business Ventures Ltd | Hospitality | 2020 |
| Adelekan Mgmt Ltd | Health & social care | 2025 |
| Adem Wholesale Ltd | Wholesale & retail | 2019 |
| Adept Builders Limited | Construction | 2026 |
| Adera Consultancy Ltd | Professional & scientific | 2025 |
| Adesek Limited | Health & social care | 2017 |
| Adex Social Care Ltd | Health & social care | 2022 |
| Adfit Marketing Ltd | Administrative & support | 2022 |
| Adhana Ltd | Real estate | 2020 |
| Adhana Property Limited | Real estate | 2024 |
| Adhia Construction & Property Ltd | Real estate | 2022 |
| ADI Construction Ltd | Construction | 2026 |
| ADI Cortes London Ltd | Other services | 2021 |
| ADI International Limited | Real estate | 2018 |
| ADI Real Estate Limited | Real estate | 2026 |
| ADI Scorpion Ltd | Wholesale & retail | 2019 |
| ADI Transport 2019 Ltd | Transport & logistics | 2020 |
| Adin Trading LLC UK Limited | Wholesale & retail | 2024 |
| Adison Info Limited | Information & communication | 2017 |
| Adithi Technologies Ltd | Information & communication | 2024 |
| Aditi Consultancy Ltd | Information & communication | 2011 |
| Aditi Group Limited | Hospitality | 2025 |
| Aditri Associates Ltd | Real estate | 2018 |
| Aditya Consultancy Limited | Information & communication | 2006 |
| Aditya Trading Company Limited | Wholesale & retail | 2004 |
| ADL Foods Ltd | Wholesale & retail | 2020 |
| ADL Software Limited | Information & communication | 1994 |
| Adless Transport Ltd | Transport & logistics | 2023 |
| Adli Properties Ltd | Real estate | 2008 |
| Adlink International (1989) Media Group Limited | Information & communication | 2014 |
| Adlink International (UK) Ltd | Professional & scientific | 1996 |
| Adlink Properties Ltd | Real estate | 2021 |
| ADM Traders Ltd | Wholesale & retail | 2025 |
| Admirals Lodge (RM1) RTM Company Limited | Households | 2017 |
| Admissions Care UK Limited | Information & communication | 2023 |
| Admo Ltd | Professional & scientific | 2010 |
| Adms Construction Limited | Construction | 2022 |
| Adms UK International Ltd | Wholesale & retail | 2020 |
| Adoptionplus | Health & social care | 2009 |
| Adorasoft Limited | Information & communication | 2016 |
| ADR Fecu Services Ltd | Construction | 2023 |
| Adrand Management Limited | Information & communication | 2007 |
| Adrenalin Management Limited | Professional & scientific | 2001 |
| Adrian Bran Ltd | Construction | 2019 |
| Adrian Ciprian Limited | Construction | 2014 |
| Adrian Court (Ilford) Management Company Limited | Real estate | 2004 |